EP2169423B1 - Capteur de radar doté d'un stabilisateur de signal blindé - Google Patents

Capteur de radar doté d'un stabilisateur de signal blindé Download PDF

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Publication number
EP2169423B1
EP2169423B1 EP09166703.0A EP09166703A EP2169423B1 EP 2169423 B1 EP2169423 B1 EP 2169423B1 EP 09166703 A EP09166703 A EP 09166703A EP 2169423 B1 EP2169423 B1 EP 2169423B1
Authority
EP
European Patent Office
Prior art keywords
circuit board
signal
housing
radar sensor
connection line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09166703.0A
Other languages
German (de)
English (en)
Other versions
EP2169423A1 (fr
Inventor
Michael Klar
Thomas Binzer
Klaus-Dieter Miosga
Oliver Brueggemann
Joachim Hauk
Dirk Steinbuch
Juergen Seiz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2169423A1 publication Critical patent/EP2169423A1/fr
Application granted granted Critical
Publication of EP2169423B1 publication Critical patent/EP2169423B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
    • G01S7/032—Constructional details for solid-state radar subsystems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/35—Details of non-pulse systems

Definitions

  • the invention relates to a radar sensor with a transmitter assembly and a signal stabilizer, which are arranged on a common circuit board, a housing receiving the signal stabilizer, which forms a shield against high frequency radiation of the signal stabilizer together with a conductive layer of the circuit board, and with a shielding crossing the connection line to Connection of the signal stabilizer to the transmitter module.
  • Such radar sensors are used, for example, as distance sensors in motor vehicles and typically operate at a frequency of 77 GHz.
  • MMICs Microwave Monolithic Integrated Circuit
  • phase locked loop PLL, phase locked loop
  • frequencies eg about 18 GHz
  • the signal stabilizer must be connected to the transmitter module so that it can act on its signal.
  • a connection of the shielded circuit parts is known via laid on the circuit board high-frequency lines, for the corresponding openings in the shield are necessary.
  • housing channels are used, which act as waveguide filter structures.
  • EP-A-1 793 489 discloses a shield of an oscillator and proposes to provide a housing which accommodates the oscillator and forms a shield against high frequency radiation of the oscillator together with a conductive layer of the circuit board, a connection line for connecting the oscillator to a transmitter assembly passing through and shielding the shield PCB is embedded.
  • EP-A-1 363 351 discloses a connection line formed as a microstrip line in the circuit board and passing through a window in the wall of the housing.
  • US-B1-6,420,778 discloses the use of a differential connection line.
  • the object of the invention is to provide a radar sensor which enables effective shielding of the radiation of the signal stabilizer with a small footprint.
  • the circuit board has an insulating layer, that the conductive layer is located on the side remote from the housing side of the insulating layer and is electrically connected via vias to the housing, and that the connection line is embedded in the printed circuit board insulated and that their tracks are formed by parts of the conductive layer which are separated by a recess from the remaining parts of this layer.
  • connection line thus does not run on the surface at which it passes through the wall of the shielding housing, on the surface of the printed circuit board, but is "buried" in the interior of the printed circuit board, so that no short circuit with the shield.
  • the shielding case is thus interrupted only by the thickness of the insulating layer or layers of the printed circuit board and is otherwise completely closed, and no additional openings for the connecting line need to be formed in the wall of the housing. As a result, a good shielding is achieved while saving the space for the previously required waveguide filter structures. Accordingly, a very simple construction of the housing is achieved.
  • connection line can be designed as a differential connection line and formed by an electrically conductive layer of the printed circuit board, which optionally also forms the ground layer of the printed circuit board.
  • the conductive connection between the connection line and the line structures running on the surface of the circuit board can then be e.g. be formed by means of vias, so-called VIAs (Vertical Interconnect Access).
  • connection is made by means of field coupling, e.g. Slot coupling, manufactured.
  • connection line can optionally also be a microstrip line.
  • Fig. 1 a part of a printed circuit board 10 is shown, on which the essential components of a radar sensor are arranged.
  • a transmitter assembly 12 of the radar sensor is formed by an MMIC.
  • a radio-frequency line 14 leads from the transmitter module 12 to an antenna, not shown, via which the radar signal is radiated and, if necessary, also the reflected signal is received again in the case of a monostatic antenna concept.
  • the signal output via the radio-frequency line 14 has, for example, a frequency of 77 GHz.
  • This frequency as well as the phase of the output signal are stabilized by means of a Phase Locked Loop (PLL) 16.
  • PLL Phase Locked Loop
  • a frequency signal is generated in the transmitter board 12 by frequency dividing the transmitted signal whose frequency is a certain fraction of the frequency of the transmitted signal, for example about 19 GHz.
  • This signal is output via a connection line 18 to a signal stabilizer 20, which is encapsulated in a shielding housing 22.
  • the signal stabilizer 20 includes an oscillator 24 having a very high quality resonator 25 that generates a reference signal having a frequency of, for example, 18 GHz, and a mixer 26 that receives the reference signal with the 19 GHz signal of the transmitter assembly 12 received via the connection line 18 mixed.
  • the mixed product which has a significantly lower frequency, is supplied via a line 28 of the PLL 16, which detects from this signal any frequency deviations of the transmission signal on the high-frequency line 14 and the transmitter assembly 12 in a closed loop so controls that the frequency deviation is eliminated.
  • the permissible emissions of high-frequency signals in the frequency range are limited by 18 GHz, ie only very low transmission powers may be emitted in this frequency range.
  • the signal output by the transmitter module 12 via the differential connection line 18 can be kept so weak that the permissible emissions are not exceeded here.
  • the signal of the oscillator 24 with the resonator 25 must not be too different from the 18 GHz signal of the transmitter assembly and must have a relatively high amplitude due to the required quality of the oscillator, so that this oscillator is a relatively strong emission source.
  • the oscillator 24, the resonator 25, and the mixer 26 connected to the oscillator are housed in the shielding electrically conductive housing 22.
  • the differential connection line 18 is formed both on the side of the transmitter module 12 and on the side of the mixer 26 by two parallel conductor tracks 30 and 32 which run on the surface of the printed circuit board 10.
  • Each of these interconnects 30, 32 is connected via a via (VIA) 34 with a conductor 36 which is embedded in the insulating material of the circuit board 10 or "buried” and thus under the circuit board 10, the wall of the housing 22 passes under and electrically from this case remains insulated.
  • the printed circuit board 10 in the example shown has a two-layer construction, with an insulating upper layer 38, the in Fig. 2 for reasons of clarity, and a continuous electrically conductive layer 40.
  • the layer 40 serves as the mass of the radar sensor.
  • the wall of the housing 22, from the in Fig. 2 only a relatively flat lower edge region is shown, sitting directly on the insulating layer 38, but is electrically connected via narrow-meshed through-holes 42 with the conductive layer 40, so that located within the housing 22 part of this layer 40 together with the housing 22nd forms a virtually completely closed shield for the signal stabilizer 20.
  • the embedded in the circuit board 10 traces 36 of the connection line 18 are formed by parts of the conductive layer 40, which are separated by a recess 44 from the remaining parts of this layer, the ground layer.
  • the weak 18 GHz signal of the transmitter module can be transmitted through the interior of the printed circuit board 10 to the mixer 26 without any additional openings having to be formed in the wall of the housing 22, which are then counteracted by elaborate filter structures against leakage radiation should be secured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Waveguides (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Claims (2)

  1. Capteur de radar doté d'un module émetteur (12) et d'un stabilisateur de signal (20), lesquels sont disposés sur une carte à circuits imprimés commune (10), un boîtier (22) recevant le stabilisateur de signal (20), qui, conjointement avec une couche conductrice (40) de la carte à circuits imprimés (10), forme un blindage contre les rayonnements haute fréquence du stabilisateur de signal (20), et doté d'une conduite de liaison (18) traversant le blindage, pour la liaison du stabilisateur de signal au module émetteur (12), caractérisé en ce que la carte à circuits imprimés (10) présente une couche d'isolation (38), en ce que la couche conductrice (40) est située du côté de la couche d'isolation (38) opposé au boîtier (22) et est connectée électriquement au boîtier (22) par le biais de trous métallisés (42), et en ce que la conduite de liaison (18) est noyée de manière isolée dans la carte à circuits imprimés (10) et en ce que ses pistes conductrices (36) sont formées par des parties de la couche conductrice (40) qui sont séparées par un évidement (44) des autres parties de cette couche.
  2. Capteur de radar selon la revendication 1, dans lequel les pistes conductrices (36) sont connectées par voie galvanique, par le biais de trous métallisés (34), à des pistes conductrices adjacentes (30, 32) s'étendant sur la carte à circuits imprimés (10).
EP09166703.0A 2008-09-29 2009-07-29 Capteur de radar doté d'un stabilisateur de signal blindé Active EP2169423B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008042449A DE102008042449A1 (de) 2008-09-29 2008-09-29 Radarsensor mit abgeschirmtem Signalstabilisator

Publications (2)

Publication Number Publication Date
EP2169423A1 EP2169423A1 (fr) 2010-03-31
EP2169423B1 true EP2169423B1 (fr) 2016-03-23

Family

ID=41202287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09166703.0A Active EP2169423B1 (fr) 2008-09-29 2009-07-29 Capteur de radar doté d'un stabilisateur de signal blindé

Country Status (3)

Country Link
US (1) US8319681B2 (fr)
EP (1) EP2169423B1 (fr)
DE (1) DE102008042449A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020102037A1 (de) 2020-01-28 2021-07-29 Krohne Messtechnik Gmbh Radaranordnung

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3426565A1 (de) 1984-07-19 1986-01-23 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Kontaktfreie verbindung fuer planare leitungen
US5906310A (en) * 1994-11-10 1999-05-25 Vlt Corporation Packaging electrical circuits
DE69732174T2 (de) * 1997-03-19 2005-12-29 Telefonaktiebolaget Lm Ericsson (Publ) Zweiteilige elektromagnetische Abschirmvorrichtung zur Befestigung auf einer Leiterplatte
US7324039B2 (en) 2004-12-16 2008-01-29 Automotive Technologies International, Inc. Short-range automotive radar transceiver
US6686867B1 (en) * 1999-07-30 2004-02-03 Volkswagen Ag Radar sensor and radar antenna for monitoring the environment of a motor vehicle
KR100761616B1 (ko) 2001-01-19 2007-09-27 마츠시타 덴끼 산교 가부시키가이샤 고주파회로소자 및 고주파회로모듈
US6420778B1 (en) 2001-06-01 2002-07-16 Aralight, Inc. Differential electrical transmission line structures employing crosstalk compensation and related methods
US6590484B2 (en) * 2001-09-12 2003-07-08 Eugene Garcia, Jr. Insulated circulator
US6980439B2 (en) * 2001-12-27 2005-12-27 Intel Corporation EMI shield for transceiver
US7092639B2 (en) * 2001-12-27 2006-08-15 Intel Corporation EMI shield for reducing clock jitter of a transceiver
US6949992B2 (en) * 2002-03-20 2005-09-27 Powerwave Technologies, Inc. System and method of providing highly isolated radio frequency interconnections
WO2003090313A1 (fr) * 2002-04-19 2003-10-30 Roadeye Flr General Partnership Concept de systeme rf pour radar de vehicules comprenant plusieurs faisceaux
JP4523223B2 (ja) * 2002-04-26 2010-08-11 株式会社日立製作所 レーダセンサ
DE10244206A1 (de) * 2002-09-23 2004-03-25 Robert Bosch Gmbh Vorrichtung zum Übertragen bzw. Abstrahlen hochfrequenter Wellen
US20040080917A1 (en) * 2002-10-23 2004-04-29 Steddom Clark Morrison Integrated microwave package and the process for making the same
US20050156780A1 (en) * 2004-01-16 2005-07-21 Ghz Tr Corporation Methods and apparatus for automotive radar sensors
EP1793489A4 (fr) 2004-09-21 2008-01-16 Murata Manufacturing Co Circuit d oscillation haute frequence et emetteur/recepteur
US9123663B2 (en) * 2008-06-10 2015-09-01 Stats Chippac, Ltd. Semiconductor device and method of forming shielding layer grounded through metal pillars formed in peripheral region of the semiconductor

Also Published As

Publication number Publication date
US8319681B2 (en) 2012-11-27
EP2169423A1 (fr) 2010-03-31
DE102008042449A1 (de) 2010-04-01
US20100103027A1 (en) 2010-04-29

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